Nuprl Lemma : es-choose_wf 11,40

es:event_system{i:l}, i:Id.
es-choose(esi b:Ides-state(esi)(?es-kindtype(esi; locl(b))) 
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DefinitionsUnit, Type, t  T, f(a), left + right, x:AB(x), Id, , x:AB(x), P  Q, es-T(es), es-Choose(es), es-V(es), es-vartype(esix), act_locl{act_locl_compseq_tag_def:ObjectId}(a), isrcv_locl{isrcv_locl_compseq_tag_def:ObjectId}(a), es-choose(esi), es-kindtype(esik), es-state(esi), x:A  B(x), event_system{i:l}
Lemmasevent system wf, Id wf, subtype rel self, nat wf, unit wf

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